diff --git a/Tethering/src/android/net/ip/RouterAdvertisementDaemon.java b/Tethering/src/android/net/ip/RouterAdvertisementDaemon.java
index 5e9bbcb5d1e026845430faaadcd5e634deab86bf..50d6c4b18d368e0362dc251d7a41041d002f509c 100644
--- a/Tethering/src/android/net/ip/RouterAdvertisementDaemon.java
+++ b/Tethering/src/android/net/ip/RouterAdvertisementDaemon.java
@@ -18,7 +18,6 @@ package android.net.ip;
import static android.system.OsConstants.AF_INET6;
import static android.system.OsConstants.IPPROTO_ICMPV6;
-import static android.system.OsConstants.SOCK_NONBLOCK;
import static android.system.OsConstants.SOCK_RAW;
import static android.system.OsConstants.SOL_SOCKET;
import static android.system.OsConstants.SO_SNDTIMEO;
@@ -39,21 +38,12 @@ import android.net.LinkAddress;
import android.net.MacAddress;
import android.net.TrafficStats;
import android.net.util.SocketUtils;
-import android.os.Handler;
-import android.os.HandlerThread;
-import android.os.Looper;
-import android.os.Message;
import android.system.ErrnoException;
import android.system.Os;
import android.system.StructTimeval;
import android.util.Log;
-import android.util.Pair;
-
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
import com.android.internal.annotations.GuardedBy;
-import com.android.net.module.util.FdEventsReader;
import com.android.net.module.util.InterfaceParams;
import com.android.net.module.util.structs.Icmpv6Header;
import com.android.net.module.util.structs.LlaOption;
@@ -113,11 +103,6 @@ public class RouterAdvertisementDaemon {
private static final int DAY_IN_SECONDS = 86_400;
- // Commands for IpServer to control RouterAdvertisementDaemon
- private static final int CMD_START = 1;
- private static final int CMD_STOP = 2;
- private static final int CMD_BUILD_NEW_RA = 3;
-
private final InterfaceParams mInterface;
private final InetSocketAddress mAllNodes;
@@ -135,13 +120,9 @@ public class RouterAdvertisementDaemon {
@GuardedBy("mLock")
private RaParams mRaParams;
- // To be accessed only from RaMessageHandler
- private RsPacketListener mRsPacketListener;
-
private volatile FileDescriptor mSocket;
private volatile MulticastTransmitter mMulticastTransmitter;
- private volatile RaMessageHandler mRaMessageHandler;
- private volatile HandlerThread mRaHandlerThread;
+ private volatile UnicastResponder mUnicastResponder;
/** Encapsulate the RA parameters for RouterAdvertisementDaemon.*/
public static class RaParams {
@@ -263,94 +244,6 @@ public class RouterAdvertisementDaemon {
}
}
- private class RaMessageHandler extends Handler {
- RaMessageHandler(Looper looper) {
- super(looper);
- }
-
- @Override
- public void handleMessage(Message msg) {
- switch (msg.what) {
- case CMD_START:
- mRsPacketListener = new RsPacketListener(this);
- mRsPacketListener.start();
- break;
- case CMD_STOP:
- if (mRsPacketListener != null) {
- mRsPacketListener.stop();
- mRsPacketListener = null;
- }
- break;
- case CMD_BUILD_NEW_RA:
- synchronized (mLock) {
- // raInfo.first is deprecatedParams and raInfo.second is newParams.
- final Pair<RaParams, RaParams> raInfo = (Pair<RaParams, RaParams>) msg.obj;
- if (raInfo.first != null) {
- mDeprecatedInfoTracker.putPrefixes(raInfo.first.prefixes);
- mDeprecatedInfoTracker.putDnses(raInfo.first.dnses);
- }
-
- if (raInfo.second != null) {
- // Process information that is no longer deprecated.
- mDeprecatedInfoTracker.removePrefixes(raInfo.second.prefixes);
- mDeprecatedInfoTracker.removeDnses(raInfo.second.dnses);
- }
- mRaParams = raInfo.second;
- assembleRaLocked();
- }
-
- maybeNotifyMulticastTransmitter();
- break;
- default:
- Log.e(TAG, "Unknown message, cmd = " + String.valueOf(msg.what));
- break;
- }
- }
- }
-
- private class RsPacketListener extends FdEventsReader<RsPacketListener.RecvBuffer> {
- private static final class RecvBuffer {
- // The recycled buffer for receiving Router Solicitations from clients.
- // If the RS is larger than IPV6_MIN_MTU the packets are truncated.
- // This is fine since currently only byte 0 is examined anyway.
- final byte[] mBytes = new byte[IPV6_MIN_MTU];
- final InetSocketAddress mSrcAddr = new InetSocketAddress(0);
- }
-
- RsPacketListener(@NonNull Handler handler) {
- super(handler, new RecvBuffer());
- }
-
- @Override
- protected int recvBufSize(@NonNull RecvBuffer buffer) {
- return buffer.mBytes.length;
- }
-
- @Override
- protected FileDescriptor createFd() {
- return mSocket;
- }
-
- @Override
- protected int readPacket(@NonNull FileDescriptor fd, @NonNull RecvBuffer buffer)
- throws Exception {
- return Os.recvfrom(
- fd, buffer.mBytes, 0, buffer.mBytes.length, 0 /* flags */, buffer.mSrcAddr);
- }
-
- @Override
- protected final void handlePacket(@NonNull RecvBuffer buffer, int length) {
- // Do the least possible amount of validations.
- if (buffer.mSrcAddr == null
- || length <= 0
- || buffer.mBytes[0] != asByte(ICMPV6_ROUTER_SOLICITATION)) {
- return;
- }
-
- maybeSendRA(buffer.mSrcAddr);
- }
- }
-
public RouterAdvertisementDaemon(InterfaceParams ifParams) {
mInterface = ifParams;
mAllNodes = new InetSocketAddress(getAllNodesForScopeId(mInterface.index), 0);
@@ -359,43 +252,48 @@ public class RouterAdvertisementDaemon {
/** Build new RA.*/
public void buildNewRa(RaParams deprecatedParams, RaParams newParams) {
- final Pair<RaParams, RaParams> raInfo = new Pair<>(deprecatedParams, newParams);
- sendMessage(CMD_BUILD_NEW_RA, raInfo);
+ synchronized (mLock) {
+ if (deprecatedParams != null) {
+ mDeprecatedInfoTracker.putPrefixes(deprecatedParams.prefixes);
+ mDeprecatedInfoTracker.putDnses(deprecatedParams.dnses);
+ }
+
+ if (newParams != null) {
+ // Process information that is no longer deprecated.
+ mDeprecatedInfoTracker.removePrefixes(newParams.prefixes);
+ mDeprecatedInfoTracker.removeDnses(newParams.dnses);
+ }
+
+ mRaParams = newParams;
+ assembleRaLocked();
+ }
+
+ maybeNotifyMulticastTransmitter();
}
/** Start router advertisement daemon. */
public boolean start() {
if (!createSocket()) {
- Log.e(TAG, "Failed to start RouterAdvertisementDaemon.");
return false;
}
mMulticastTransmitter = new MulticastTransmitter();
mMulticastTransmitter.start();
- mRaHandlerThread = new HandlerThread(TAG);
- mRaHandlerThread.start();
- mRaMessageHandler = new RaMessageHandler(mRaHandlerThread.getLooper());
+ mUnicastResponder = new UnicastResponder();
+ mUnicastResponder.start();
- return sendMessage(CMD_START);
+ return true;
}
/** Stop router advertisement daemon. */
public void stop() {
- if (!sendMessage(CMD_STOP)) {
- Log.e(TAG, "RouterAdvertisementDaemon has been stopped or was never started.");
- return;
- }
-
- mRaHandlerThread.quitSafely();
- mRaHandlerThread = null;
- mRaMessageHandler = null;
-
closeSocket();
// Wake up mMulticastTransmitter thread to interrupt a potential 1 day sleep before
// the thread's termination.
maybeNotifyMulticastTransmitter();
mMulticastTransmitter = null;
+ mUnicastResponder = null;
}
@GuardedBy("mLock")
@@ -605,7 +503,7 @@ public class RouterAdvertisementDaemon {
final int oldTag = TrafficStats.getAndSetThreadStatsTag(TAG_SYSTEM_NEIGHBOR);
try {
- mSocket = Os.socket(AF_INET6, SOCK_RAW | SOCK_NONBLOCK, IPPROTO_ICMPV6);
+ mSocket = Os.socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
// Setting SNDTIMEO is purely for defensive purposes.
Os.setsockoptTimeval(
mSocket, SOL_SOCKET, SO_SNDTIMEO, StructTimeval.fromMillis(send_timout_ms));
@@ -667,17 +565,34 @@ public class RouterAdvertisementDaemon {
}
}
- private boolean sendMessage(int cmd) {
- return sendMessage(cmd, null);
- }
+ private final class UnicastResponder extends Thread {
+ private final InetSocketAddress mSolicitor = new InetSocketAddress(0);
+ // The recycled buffer for receiving Router Solicitations from clients.
+ // If the RS is larger than IPV6_MIN_MTU the packets are truncated.
+ // This is fine since currently only byte 0 is examined anyway.
+ private final byte[] mSolicitation = new byte[IPV6_MIN_MTU];
- private boolean sendMessage(int cmd, @Nullable Object obj) {
- if (mRaMessageHandler == null) {
- return false;
- }
+ @Override
+ public void run() {
+ while (isSocketValid()) {
+ try {
+ // Blocking receive.
+ final int rval = Os.recvfrom(
+ mSocket, mSolicitation, 0, mSolicitation.length, 0, mSolicitor);
+ // Do the least possible amount of validation.
+ if (rval < 1 || mSolicitation[0] != asByte(ICMPV6_ROUTER_SOLICITATION)) {
+ continue;
+ }
+ } catch (ErrnoException | SocketException e) {
+ if (isSocketValid()) {
+ Log.e(TAG, "recvfrom error: " + e);
+ }
+ continue;
+ }
- return mRaMessageHandler.sendMessage(
- Message.obtain(mRaMessageHandler, cmd, obj));
+ maybeSendRA(mSolicitor);
+ }
+ }
}
// TODO: Consider moving this to run on a provided Looper as a Handler,